> ## Documentation Index > Fetch the complete documentation index at: https://docs.mx.com/llms.txt > Use this file to discover all available pages before exploring further. # Testing the Platform API We provide several tools to help you test our API. From our OpenAPI specification to our test institutions, you can make requests to our API to learn more about integrating your application with our connectivity solutions. ## When To Use MX Bank vs. MXCU We offer four test institutions that you can use: * **MXCU (OAuth)** takes you through a hypothetical OAuth flow that results in the MX platform receiving an OAuth token it uses to connect the member. * **MXCU (Credential)** is a credential-based authentication where you'll enter the MXCU credentials. * **MX Bank** has more account types and features available than both MXCU institutions. It also lets you test different connection statuses. * **MX Bank (OAuth)** previously was our only test institution for OAuth flows. We recommend you instead use the MXCU (OAuth) institution if you want to test an OAuth-flow since it offers a full OAuth experience. If you plan on using an MXCU test institution, see [Testing with MXCU](/resources/test-platform/mxcu/) If you plan on using an MX Bank test institution, see [Testing with MX Bank](/resources/test-platform/mxbank/) ## Using our API with Postman You can download our [OpenAPI Specification](/openapi/platform-api/v20250224.yaml) and import it into [Postman](https://postman.com) to learn more about our API and its request and response payloads. When using our OpenAPI specification in Postman you'll need your `api_key` and `client_id` from the [Client Dashboard](https://dashboard.mx.com). This can be used with Basic Authentication where your `client_id` is the username and your `api_key` is the password. **INFO** Our OpenAPI specification uses tags to gather common requests together. When you import the specification as a collection, we encourage you to set the folder organization to "Tags" for the best experience.